Railroad Archives Online
- CollectionD0063 - Walter W. Ainsworth Collection
- Series010 - Other Railroads
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3003 - Freight Cars
- ItemWWAPC0265 - Columbia & Puget Sound Railroad box car number 163 at Renton, Washington, circa 1910.
- ItemWWAPC0502 - Columbia and Puget Sound Railroad freight cars number 124 at Taylor, Washington in 1914.
- ItemWWAPC0566 - Pacific Coast Railway box car number 1222 in California, circa 1928.
- ItemWWAPCN0215 - Pacific Coast Railway wood box car at San Luis Obispo, California in 1938.